Solar Impulse's team chief Bertrand Piccard, left, and Solar Impulse's Chief Executive Officer and pilot Andre Borschberg celebrate after successfully landing the solar-powered HB-SIA prototype airplane after its first successful night flight attempt at Payerne airport, Switzerland, on Thursday, July 8, 2010. The aircraft took off July 7 at 06:51 a.m. and reached an altitude of 28,543 feet by the end of the day. It then slowly descent to 4,921 feet and flew during the night on the batteries, charged during the day by 12,000 solar cells, which powered the four electric motors. It landed July 8 at 09.00 a.m. for a flight time of 26 hours 9 minutes setting the longest and highest flight ever made by a solar plane. (AP Photo/Keystone, Dominic Favre, Pool)

Solar Impulse's team chief Bertrand Piccard, left, and Solar Impulse's Chief Executive Officer and pilot Andre Borschberg celebrate after successfully landing the solar-powered HB-SIA prototype airplane after its first successful night flight attempt at Payerne airport, Switzerland, on Thursday, July 8, 2010. The aircraft took off July 7 at 06:51 a.m. and reached an altitude of 28,543 feet by the end of the day. It then slowly descent to 4,921 feet and flew during the night on the batteries, charged during the day by 12,000 solar cells, which powered the four electric motors. It landed July 8 at 09.00 a.m. for a flight time of 26 hours 9 minutes setting the longest and highest flight ever made by a solar plane. (AP Photo/Keystone, Dominic Favre, Pool)